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btrfs: send: avoid unnecessary path allocations when finding extent clone
When looking for an extent clone, at find_extent_clone(), we start by allocating a path and then check for cases where we can't have clones and exit immediately in those cases. It's a waste of time to allocate the path before those cases, so reorder the logic so that we check for those cases before allocating the path. Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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1a1a285139
commit
61ce908a3c
1 changed files with 16 additions and 21 deletions
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@ -1365,40 +1365,35 @@ static int find_extent_clone(struct send_ctx *sctx,
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int compressed;
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u32 i;
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tmp_path = alloc_path_for_send();
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if (!tmp_path)
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return -ENOMEM;
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/* We only use this path under the commit sem */
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tmp_path->need_commit_sem = 0;
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if (data_offset >= ino_size) {
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/*
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* There may be extents that lie behind the file's size.
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* I at least had this in combination with snapshotting while
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* writing large files.
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*/
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ret = 0;
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goto out;
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return 0;
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}
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fi = btrfs_item_ptr(eb, path->slots[0],
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struct btrfs_file_extent_item);
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fi = btrfs_item_ptr(eb, path->slots[0], struct btrfs_file_extent_item);
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extent_type = btrfs_file_extent_type(eb, fi);
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if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
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ret = -ENOENT;
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goto out;
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}
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compressed = btrfs_file_extent_compression(eb, fi);
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if (extent_type == BTRFS_FILE_EXTENT_INLINE)
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return -ENOENT;
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num_bytes = btrfs_file_extent_num_bytes(eb, fi);
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disk_byte = btrfs_file_extent_disk_bytenr(eb, fi);
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if (disk_byte == 0) {
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ret = -ENOENT;
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goto out;
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}
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if (disk_byte == 0)
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return -ENOENT;
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compressed = btrfs_file_extent_compression(eb, fi);
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num_bytes = btrfs_file_extent_num_bytes(eb, fi);
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logical = disk_byte + btrfs_file_extent_offset(eb, fi);
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tmp_path = alloc_path_for_send();
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if (!tmp_path)
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return -ENOMEM;
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/* We only use this path under the commit sem */
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tmp_path->need_commit_sem = 0;
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down_read(&fs_info->commit_root_sem);
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ret = extent_from_logical(fs_info, disk_byte, tmp_path,
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&found_key, &flags);
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